 Child mortality has decreased in every developing region of the world.The proportion of the world's population living in countries where per-capita food supplies are less than 2,200 calories (9,200 kilojoules) per day decreased from 56% in the mid-1960s to below 10% by the 1990s.Between 1950 and 1999, global literacy increased from 52% to 81% of the world.